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Income Taxes (Narrative) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2037
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Tax Examination          
Tax Expense (Benefit)     $ 463 $ 523 $ 223
Tax Expense (Benefit) from the Remeasurement of Deferred Taxes     (69) (15) $ (255)
Undistributed Foreign Earnings with Recorded Deferred Taxes     117 190  
Undistributed earnings of foreign subsidiaries     4,500    
Valuation Allowance          
Operating Loss Carryforwards, Valuation Allowance     743    
Income tax loss carryforwards, subject to expiration     481    
Remaining amount of loss carryforwards that has no expiration date     262    
Unrecognized tax benefits that would reduce our effective tax rate if recognized     297    
Total accrued penalties and net accrued interest     35 $ 47  
Scenario, Forecast          
Valuation Allowance          
Aggregate resolution of uncertainties   $ 220      
U.S. Tax Cuts and Jobs Act          
Income Tax Examination          
Tax Expense (Benefit)     76    
Transition Tax Expense (Benefit)     278    
Tax Expense (Benefit) from the Remeasurement of Deferred Taxes     (202)    
Income Tax Expense (Benefit) from Tax Planning Actions Taken in Anticipation of the U.S. Tax Cuts and Jobs Act     (152)    
Undistributed Foreign Earnings with Recorded Deferred Taxes     $ 1,000    
Minimum | Scenario, Forecast          
Valuation Allowance          
Operating Loss Carryforwards, Expiration Date   Jan. 01, 2018      
Maximum | Scenario, Forecast          
Valuation Allowance          
Operating Loss Carryforwards, Expiration Date Dec. 31, 2037